Aquapower Mini-E 4-2
0.98 UEF DOE CCD · 2026-09-19Grade D: where this UEF sits among the 271 models in its class, lowest (G) to highest (A). A position, not an official label. How the grade is set
An electric tankless unit, very small draw pattern (small units - a single bathroom, or a point-of-use heater under a sink).
Checking the Aquapower Mini-E 4-2? It uses 603 kWh of electricity a year at the very small draw pattern, the standard daily hot-water usage DOE tests against. That is 12 kWh below the class median of 615 kWh among 271 registered electric tankless models.
Energy use per year
603 kWh a year
Computed by this site from the registry's UEF and the federal test's daily hot-water draw for this draw pattern. What it costs depends on the electricity rate where you live.
That is below the median of 615 kWh for the 271 models registered in the same heater type and draw pattern; it ranks 10 of 271, lowest energy first.
Solid line: this model (603 kWh). Dashed line: the class median.
Min 562 kWh Median 615 kWh Max 649 kWh
What it costs to run where you live
What the registry files
- UEF (Uniform Energy Factor) how much hot water you get for each unit of energy the heater uses
- 0.98 DOE CCD · 2026-09-19 Compared only with other models registered as an electric tankless unit at the very small draw pattern.
- Draw Pattern the standard daily usage profile DOE tests the unit against
- Very small DOE CCD · 2026-09-19
- Maximum Gallons Per Minute how many gallons a minute it can heat while running continuously
- 0.4 gal/min DOE CCD · 2026-09-19
What it costs to install
$1,311–$1,886 installed
Not a quote — a modeled range of what installers have charged for this class of unit; your price will vary with labor rates, access, and local code requirements.
Escalation indexes: equipment (BLS PPI) latest available: August 2026; labor (BLS ECI) latest available: April 2026 to June 2026.
NLR REMDB (BLS PPI/ECI escalated) · 2026-04-01Safety record
No CPSC recall names this model.
Checked against the CPSC recall database. CPSC does not publish a model-level match for this product category, so this list is curated by hand from the manufacturer's recall filings.
CPSC · 2026-09-24What these figures mean
How this compares
The closest models in the same class — same fuel, type and draw pattern.
Keep going
How every figure on this page is calculated
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Find what replaces your water heater
Enter the model number off your old unit and see what is on file today, with the yearly cost difference.
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Find a water heater that fits
Three questions — fuel, hot water need, install space — narrow every model on file to the ones that fit.
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What a water heater costs to run
Prices a unit's efficiency against your own utility's filed tariff for your ZIP code.
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How to size a tankless water heater by GPM
Answered from what models in this size actually file.
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Water heaters
Every model on file with the Department of Energy, by heater type.
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All electric tankless water heaters
Electric instantaneous units, sized by flow rate rather than tank gallons.
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Every Aquapower model on file
What this brand files, by heater type.
UEF 0.98 · Grade D Price it on your ZIP
The 603 kWh figure is not a registry value. This site computed it from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.98 for this unit, and from the daily hot-water draw in the DOE test for the very small draw pattern. The fuel is electricity, and the source is DOE CCD, retrieved 2026-09-19. Among the 271 electric tankless models at this draw pattern, the Aquapower Mini-E 4-2 has the 10th lowest energy use, which places it in the lowest quarter of its class. Its distance from the class median of 615 kWh is 12 kWh. The method is set out on the methodology page.
The registry lists a maximum flow rate in gallons per minute of 0.4 for this unit. Together with the very small draw pattern, that fits small units: a single bathroom, or a point-of-use heater under a sink. The 603 kWh figure applies only under that draw pattern. A household with a larger hot-water demand is outside the condition the figure was computed for, and this page has no energy value for other draw patterns. That data is not available here. To compare units by fuel, space and size, use the water heater selector.
The running cost is not written in this text because it depends on your own electricity tariff. The 603 kWh figure, at the very small draw pattern, is the quantity to multiply by your rate. The 12 kWh gap below the class median of 615 kWh converts to a cost difference at that same rate. The cost calculator takes your ZIP and does that calculation. The installed price range appears in its own block with its source and date, as a modeled range and not a quote. To look for a unit in the same class, you can find a replacement by model number. This page does not measure the unit in a home; it reports registry data and one computed value.
DOE CCD · 2026-09-19